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The Influence of Desulfovibrio Desulfuricans on Neptunium Chemistry

Published online by Cambridge University Press:  10 February 2011

L. Soderholm ,
C.W. Williams ,
Mark R. Antonio ,
Monica Lee Tischler  and
Michael Markos
L. Soderholm
Affiliation:
Chemistry Division, Argonne National Laboratory, Argonne, IL, 60439. ls@anl.gov, mantonio@anl.goV
C.W. Williams
Affiliation:
Chemistry Division, Argonne National Laboratory, Argonne, IL, 60439. ls@anl.gov, mantonio@anl.goV
Mark R. Antonio
Affiliation:
Chemistry Division, Argonne National Laboratory, Argonne, IL, 60439. ls@anl.gov, mantonio@anl.goV
Monica Lee Tischler
Affiliation:
Department of Biological Sciences, Benedictine University, Lisle IL
Michael Markos
Affiliation:
Department of Biological Sciences, Benedictine University, Lisle IL
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Abstract

Biotic Np(V) reduction is studied in light of its potential role for the environmental immobilization of this hazardous radionuclide. The speciation of Np in Desulfovibrio desulfuricans cultures is compared with Np speciation in the spent medium and in the uninoculated medium. Precipitates formed in all three samples. Optical spectroscopy, x-ray diffraction, and x-ray absorption near edge structure (XANES) were used to determine the Np speciation. After 5 days of incubation, there was very little Np left in solution, which was present as Np(V). The precipitate that formed in all samples is an amorphous Np(IV) species, establishing that Np(V) is almost quantitatively reduced. These results demonstrate that the reduction of Np is independent of Desulfovibrio desulfuricans. The underlying chemistry associated with these results is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 590: Symposium R – Applications of Synchrotron Radiation Techniques…V , 1999 , 27
Copyright
Copyright © Materials Research Society 2000

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References

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